National's tax policy teaser: Christopher Luxon reveals how much cash 'squeezed middle' could get under highly-anticipated fiscal plan

The National Party's tax policy guessing game is finally coming to an end on Wednesday morning.

And Christopher Luxon won't be slapping a tax on vapes - for now, at least - to pay for its highly-anticipated fiscal policy.

The National leader was giving little away during his AM appearance on Wednesday to discuss his party's tax policy, set to be unveiled at 10:30am.

Without revealing the full plan, National has said families without children earning less than $120,000 a year could get an extra $100 in their pocket each fortnight, which extended to $250 every two weeks for those with children.

Support would also increase for superannuants and minimum wage workers.

National's tax policy teaser: Christopher Luxon reveals how much cash 'squeezed middle' could get under highly-anticipated fiscal plan

Luxon said unlike some of Labour's cost-of-living measures, this relief would come with no strings attached.

"It's a pretty exciting day," he told AM host Ryan Bridge ahead of National's announcement. "We're here to give help to the squeezed middle who have been doing it really tough and have been absolutely hammered by this Government.

"There's a range of relief that we're actually being able to offer. As we've talked about, a large part of it is actually adjusting the tax thresholds.

"I think what's really exciting is we've focused and targeted this plan on the squeezed middle, as we call them."

But questions remained as to exactly how National would fund its plan, with the party confirming four new revenue-gathering measures but remaining tight-lipped on what those measures were, given it opposed taxes on wealth and capital gains. Newshub understands a churches or charities tax is also off the table and Luxon on Wednesday morning ruled out a vape tax - for now.

"I'm up for looking at that into the future - I think there's lots of other ideas and proposals around revenue-rasing measures," said Luxon.

However, a vape tax wasn't included in its plan for this election, he said.

"We haven't looked at that and actually considered that for this tax plan, we're very comfortable that we've actually got the mix right to deliver for the squeezed middle."

Labour leader Chris Hipkins has slammed National for proposing new revenue-gathering measures, saying it was desperate "spending two years saying that tax cuts are affordable, and now… trying to scrabble together four new taxes in order to pay for them". 

But Luxon said New Zealanders were "going to be quite impressed" at the measures National was proposing.

"Any revenue we're raising is not coming from the squeezed middle," said Luxon.

"What I'd say to you about the Labour Government and Labour Party is they have no credibility on economic management."

Other political parties had already released their tax policies, including Labour's proposal to remove GST from fresh and frozen fruit and vegetables. The Green Party is campaigning for a wealth tax and changes to income rates, while Te Pāti Māori wants GST off all food, a wealth tax and other smaller taxes. 

National's fellow right-bloc party ACT wants a simplified tax system, with just two income rates.